Mating heifers as yearlings, as opposed to two year-olds, is often billed as an advantageous tactic. For this reason, there has been a large focus on the pre- and post-joining management of heifers to maximise initial conception rates and this has subsequently improved post-partum performance. The first drop of:calves "from heifers%as historically posed a large management issue for producers. These calves are usually smaller and lighter than calves from mature cows, making it difficult to manage theliveweight gain of the total calf-drop when targeting a sale end-point.
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